And the difference between Yin Seal and Kurama is that the latter is a separate being which we literally see Naruto calling out to jelp him undo his sealed Chakra points.
No it wouldn't, Yin Seal is more like Curse Seal than it is like Kurama. and they wouldn't be able to mold and pump as you put it with their chakra points closed to begin with.
Key difference is a separate consciousness, just like with Genjutsu.
Volume doesn't matter since Hinata used 64 Palms on a Juubi Clone which would naturally have Rikudo Chakra.
Anyways...
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Not only is Naruto directing TALKING to Kurama to give him power, but Kurama also refers to this, saying that Naruto always came to him whenever something came up he couldn’t handle. It likely isn’t the type of Chakra that did that, since, like I said before, we see Hinata use the 64 Palms on a Juubi Clone, so it seems likely that instead its because Kurama is his own being that he was able to help Naruto, and not the TYPE of Chakra.
Naruto had to depend on another individual, another being with Chakra, to open his Chakra Points. Whereas Sakura would be depending on nothing more than a seal, so it can’t be said for certain that this would work. Naruto and Kurama are treated like two people fighting at once, such as how Kurama’s always providing Naruto with Chakra. Same way how Bijuus snap users out of Genjutsu because they act as a separate individual with their own Chakra network, same goes for undoing closed Chakra Points. This is the most sensible explanation imo. Obviously its not the potency of Chakra, since we saw Hinata close off the points of a Juubi Clone. Likewise, it’s unlikely that it’s merely because its a separate Chakra source/seal, since we see that Naruto has to ask Kurama to give him the Chakra, meaning another individual has to deliberately and willingly pump the victim of Gentle Fist with chakra, something Sakura wouldn’t be able to do since her Yin Seal doesn’t house a conscious being.